The concept of this game is cool and it is also well implemented with some exceptions. Obviously the graphics could be improved upon and the main menu is very confused. The pixelated text is hard to read on top of the levels and having the shifty sands be a mechanic that only makes you reset at random times is a bit dull (maybe they could always push you a certain direction, making kind of a one way door), but other than that your level design is very good.